--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/share/vm/classfile/classFileStream.hpp Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,118 @@
+/*
+ * Copyright 1997-2005 Sun Microsystems, Inc. All Rights Reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ */
+
+// Input stream for reading .class file
+//
+// The entire input stream is present in a buffer allocated by the caller.
+// The caller is responsible for deallocating the buffer and for using
+// ResourceMarks appropriately when constructing streams.
+
+class ClassFileStream: public ResourceObj {
+ private:
+ u1* _buffer_start; // Buffer bottom
+ u1* _buffer_end; // Buffer top (one past last element)
+ u1* _current; // Current buffer position
+ char* _source; // Source of stream (directory name, ZIP/JAR archive name)
+ bool _need_verify; // True if verification is on for the class file
+
+ void truncated_file_error(TRAPS);
+ public:
+ // Constructor
+ ClassFileStream(u1* buffer, int length, char* source);
+
+ // Buffer access
+ u1* buffer() const { return _buffer_start; }
+ int length() const { return _buffer_end - _buffer_start; }
+ u1* current() const { return _current; }
+ void set_current(u1* pos) { _current = pos; }
+ char* source() const { return _source; }
+ void set_verify(bool flag) { _need_verify = flag; }
+
+ void check_truncated_file(bool b, TRAPS) {
+ if (b) {
+ truncated_file_error(THREAD);
+ }
+ }
+
+ void guarantee_more(int size, TRAPS) {
+ size_t remaining = (size_t)(_buffer_end - _current);
+ unsigned int usize = (unsigned int)size;
+ check_truncated_file(usize > remaining, CHECK);
+ }
+
+ // Read u1 from stream
+ u1 get_u1(TRAPS);
+ u1 get_u1_fast() {
+ return *_current++;
+ }
+
+ // Read u2 from stream
+ u2 get_u2(TRAPS);
+ u2 get_u2_fast() {
+ u2 res = Bytes::get_Java_u2(_current);
+ _current += 2;
+ return res;
+ }
+
+ // Read u4 from stream
+ u4 get_u4(TRAPS);
+ u4 get_u4_fast() {
+ u4 res = Bytes::get_Java_u4(_current);
+ _current += 4;
+ return res;
+ }
+
+ // Read u8 from stream
+ u8 get_u8(TRAPS);
+ u8 get_u8_fast() {
+ u8 res = Bytes::get_Java_u8(_current);
+ _current += 8;
+ return res;
+ }
+
+ // Get direct pointer into stream at current position.
+ // Returns NULL if length elements are not remaining. The caller is
+ // responsible for calling skip below if buffer contents is used.
+ u1* get_u1_buffer() {
+ return _current;
+ }
+
+ u2* get_u2_buffer() {
+ return (u2*) _current;
+ }
+
+ // Skip length u1 or u2 elements from stream
+ void skip_u1(int length, TRAPS);
+ void skip_u1_fast(int length) {
+ _current += length;
+ }
+
+ void skip_u2(int length, TRAPS);
+ void skip_u2_fast(int length) {
+ _current += 2 * length;
+ }
+
+ // Tells whether eos is reached
+ bool at_eos() const { return _current == _buffer_end; }
+};